Find Middle of Linked List

#include
#include "linkedlist.h"

#define LL_LIMIT 6
int main()
{
    int midData;
    int index=LL_LIMIT;
    NODE* headNode=NULL;
    NODE* oneStepPtr=NULL;
    NODE* twoStepPtr=NULL;

    /* Create LL*/
    while(index > 0)
    {
        headNode = addAtHead(headNode, index);
        index--;
    }

    /* Display LL*/
    displayAll(headNode);

    oneStepPtr = headNode;
    twoStepPtr = headNode;

    /* Increment step pointers till the end */
    while(twoStepPtr != NULL &&
          twoStepPtr->next != NULL &&
          twoStepPtr->next->next != NULL)
    {
        oneStepPtr = oneStepPtr->next;
        twoStepPtr = twoStepPtr->next->next;
    }
    midData = oneStepPtr->data;

    printf("Middle of LL contains %d\n", midData);
    return 0;
}